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- 저자 : Hiu Liu (검색결과 2 건)
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Hiu Liu,Nana Xin,Qingxi Cao,Long Sha,Dezhi Sun,Shaohua Wu 한국화학공학회 2009 Korean Journal of Chemical Engineering Vol.26 No.4
The Computational fluid dynamics (CFD) code PHOENICS is applied to simulate and evaluate the combustion process within the furnace of a 1,000MW dual circle tangential firing single furnace lignite-fired ultra supercritical (USC) boiler. The dependence on overfire air (OFA) positioning on the combustion process is studied. The results show that the highest temperature appears on the upside of the burner zone close to the front wall, and the high temperature zone rises with elevated OFA positions. However, the temperature field distributions are similar despite differing OFA positions. The char content near the rear wall is higher than that near the front wall, and below the furnace arch, coal particles concentrate towards the front wall. Also with elevated OFA positions, nitrogen oxide (NOx) concentrations at the outlet fall, but char content increases. In regard to NOx emission and char burnout, the suggested optimal distance from the OFA center to the center of the uppermost primary air nozzle should be 6 meters.
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An Orthogonal Study of Industrial Scale Colour Fading Process of Cotton Fabric
Yao-hui Liu,Chester Kin-Man To,Hiu-yan Cheung,Chi-wai Kan,Hong Chua 한국섬유공학회 2019 Fibers and polymers Vol.20 No.3
Colour fading is now a popular process used for imparting a vintage look to textile and fashion products, whichenhances market value because of the current fashion trends. This study examined a non-aqueous colour fading process with the use of oxygen plasma-induced ozone treatment. An industrial scale machine and commercially available red sulpur-dyed cotton fabric (with 0.5 %, 1.5 % and 2.5 % colour depths) were used in this study. Since the colour fading process factors are inter-related to each other, a specific experiment approach, i.e. orthogonal method, was used for obtaining the optimum conditions in an industrial scale colour fading process. Three process factors used in the industrial scale colour fading process, i.e. (i) oxygen gas concentration (%); (ii) amount of water in fabric (%); and (iii) treatment time (minutes), would be studied in this paper. Through the orthogonal method, the optimum conditions for colour fading of the three colour depths of cotton fabric dyed by red sulphur dye were determined and their optimum conditions were same. The optimum conditions of the colour fading of the three colour depths were: (i) 70 % oxygen gas concentration; (ii) 35 % amount of water in fabric; and (iii) 30 minutes treatment time. Although colour fading conditions are the same, the order of importance of these process factors was different. Unlike the conventional colour fading process, oxygen plasma-induced ozone colour fading treatment can achieve uniform and even colour fading effect in the cotton fabric effectively.
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